Index: Application/Ringtoets/src/Application.Ringtoets.Storage/Read/Piping/PipingCalculationOutputEntityReadExtensions.cs
===================================================================
diff -u -ra5714fc0488030773fff50dfc82041c6cb9edc2f -ra294987551b0b2d8a27b6e1bc6235b0e2351b6f4
--- Application/Ringtoets/src/Application.Ringtoets.Storage/Read/Piping/PipingCalculationOutputEntityReadExtensions.cs	(.../PipingCalculationOutputEntityReadExtensions.cs)	(revision a5714fc0488030773fff50dfc82041c6cb9edc2f)
+++ Application/Ringtoets/src/Application.Ringtoets.Storage/Read/Piping/PipingCalculationOutputEntityReadExtensions.cs	(.../PipingCalculationOutputEntityReadExtensions.cs)	(revision a294987551b0b2d8a27b6e1bc6235b0e2351b6f4)
@@ -40,9 +40,9 @@
         /// <returns>A new <see cref="PipingOutput"/>.</returns>
         internal static PipingOutput Read(this PipingCalculationOutputEntity entity)
         {
-            return new PipingOutput(entity.UpliftZValue.ToNanableDouble(), entity.UpliftFactorOfSafety.ToNanableDouble(),
-                                    entity.HeaveZValue.ToNanableDouble(), entity.HeaveFactorOfSafety.ToNanableDouble(),
-                                    entity.SellmeijerZValue.ToNanableDouble(), entity.SellmeijerFactorOfSafety.ToNanableDouble())
+            return new PipingOutput(entity.UpliftZValue.ToNullAsNaN(), entity.UpliftFactorOfSafety.ToNullAsNaN(),
+                                    entity.HeaveZValue.ToNullAsNaN(), entity.HeaveFactorOfSafety.ToNullAsNaN(),
+                                    entity.SellmeijerZValue.ToNullAsNaN(), entity.SellmeijerFactorOfSafety.ToNullAsNaN())
             {
                 StorageId = entity.PipingCalculationOutputEntityId
             };